<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<script>
//属性
var arr=[1,2,3,4]
//alert(arr.length)

//方法
	//push
//arr.push(5)
	//unshift
//arr.unshift('a','b')

	//pop
//alert(arr.pop())
	//shift
//alert(arr.shift())

arr.splice(0,0,'a','b')






alert(arr)	


</script>
</body>
</html>
